Cooling device

ABSTRACT

A cooling device includes: a cold plate; a radiator; a pump; a first tank; and a second tank. The cold plate has a first cooling medium flow passage. The radiator has fins and pipes forming a second cooling medium flow passage. The pump circulates a cooling medium. The first tank is coupled to one ends of the pipes. The second tank couples the other ends of the pipes to the pump. The radiator is disposed on the cold plate. The cold plate has a bottom wall portion, a top wall portion, a side wall portion, an internal space, an inlet port, and an outlet port. The bottom wall portion has blades, and an inner peripheral wall of the side wall portion has a first bent portion.

CROSS REFERENCE TO RELATED APPLICATION

The present invention claims priority under 35 U.S.C. § 119 to JapaneseApplication No. 2018-248651 filed on Dec. 28, 2018 the entire content ofwhich is incorporated herein by reference.

1. FIELD OF THE INVENTION

The present disclosure relates to a cooling device.

2. BACKGROUND

A conventional cooling device includes a cold plate. For example, thereis a cold plate including: a lid body having a cooling medium inletthrough-hole and a cooling medium outlet through-hole; and a base platehaving a lower face to be connected to a heat-generating component. Onthe upper face of the base plate, a plurality of plate-shaped fins areprovided. A space formed between the inner face of the lid body and themain face of the cold plate forms a flow path for a cooling medium.

The cooling medium that has flowed from the cooling medium inletthrough-hole into the space formed between the inner face of the lidbody and the main face of the cold plate exchanges heat with theplate-shaped fins and flows out through the cooling medium outletthrough-hole. In this way, the heat-generating component is cooled.

However, in the above-described cooling device, the base plate has arectangular shape in a top view, and the strength is low in anon-formation region where the plate-shaped fins are not provideddirectly below the cooling medium inlet through-hole and the coolingmedium outlet through-hole. For this reason, there is a problem thatwhen the lower face of the base plate is brought into contact with aheat-generating component, the base plate deforms in the non-formationregion where the plate-shaped fins are not formed.

SUMMARY

An exemplary cooling device of the present disclosure includes: a coldplate; a radiator; a pump; a first tank; and a second tank. The coldplate has a first cooling medium flow passage in which a cooling mediumflows. The radiator has a plurality of fins and a plurality of pipesforming a second cooling medium flow passage communicating with thefirst cooling medium flow passage. The pump circulates the coolingmedium. The first tank is coupled to one ends of the plurality of pipes.The second tank couples the other ends of the plurality of pipes to thepump. The radiator is disposed on the cold plate. The cold plate has abottom wall portion, a top wall portion, a side wall portion, aninternal space, an inlet port, and an outlet port. The lower face of thebottom wall portion comes into contact with a heat-generating component.The top wall portion covers the upper face of the bottom wall portion.The side wall portion couples a peripheral portion of the bottom wallportion and a peripheral portion of the top wall portion. The internalspace is surrounded by the bottom wall portion, the top wall portion,and the side wall portion to form the first cooling medium flow passage.The inlet port is disposed on one end side of the first cooling mediumflow passage, and the cooling medium flows into the inlet port. Theoutlet port is disposed on the other end side of the first coolingmedium flow passage, and the cooling medium flows out of the outletport. The bottom wall portion has a plurality of blades on the upperface, and an inner peripheral wall of the side wall portion has a firstbent portion which is bent to be convex inward between one ends of theblades and the outlet port.

The above and other elements, features, steps, characteristics andadvantages of the present disclosure will become more apparent from thefollowing detailed description of the example embodiments with referenceto the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top perspective view of a cooling device according to anexample embodiment of the present disclosure.

FIG. 2 is a bottom perspective view of the cooling device according tothe example embodiment of the present disclosure.

FIG. 3 is a top view of the cooling device according to the exampleembodiment of the present disclosure.

FIG. 4 is a perspective cross-sectional view taken along the line A-A inFIG. 3.

FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 3.

FIG. 6 is a bottom view illustrating a top wall portion and a side wallportion of a cold plate of the cooling device according to the exampleembodiment of the present disclosure.

FIG. 7 is a top view illustrating a bottom wall portion of the coldplate of the cooling device according to the example embodiment of thepresent disclosure.

DETAILED DESCRIPTION

Hereinafter, an example embodiment of the present disclosure will bedescribed with reference to the drawings. In the present disclosure, aside on which a radiator 20 is disposed relative to a cold plate 10 isreferred to as an “upper side” and a side opposite to the side on whichthe radiator 20 is disposed is referred to as a “lower side”. In thepresent disclosure, a direction in which the radiator 20 is disposedrelative to the cold plate 10 is referred to as a “vertical direction”and a direction orthogonal to the “vertical direction” is referred to asa “horizontal direction” for describing the shapes and positionalrelationships of the parts. This defines the vertical direction and thehorizontal direction merely for the sake of description and does notlimit the directions during manufacture and use of a cooling device 1according to the present disclosure. In the present disclosure, alongitudinal direction and a lateral direction of the cold plate 10 inthe top view are referred to as a “longitudinal direction X” and a“lateral direction Y”, respectively.

In the present disclosure, a “parallel direction” includes asubstantially parallel direction. In the present disclosure, an“orthogonal direction” includes a substantially orthogonal direction.

A cooling device of an example embodiment of the present disclosure willbe described. FIGS. 1 and 2 are a top perspective view and a bottomperspective view of a cooling device 1 according to the exampleembodiment of the present disclosure. FIG. 3 is a top view of thecooling device 1 and FIG. 4 is a perspective cross-sectional view takenalong the line A-A in FIG. 3. FIG. 5 is a cross-sectional view takenalong the line B-B in FIG. 3.

In FIG. 2, an inlet port 13 a, an outlet port 13 b, a discharge port 31b, an outward portion 31 c, and a downward portion 31 d, which are notseen from the appearance of the cooling device 1, are indicated bydashed lines. In FIG. 3, the inlet port 13 a, the outlet port 13 b, asuction port 31 a, the discharge port 31 b, a first tank through-hole 41a, and a second tank through-hole 42 a, which are not seen from theappearance of the cooling device 1, are indicated by dashed lines.

The cooling device 1 includes a cold plate 10, a radiator 20, a firsttank 41, a second tank 42, and a pump 30. The radiator 20, the firsttank 41, and the second tank 42 are disposed on the cold plate 10. Thelower faces of the radiator 20, the first tank 41, and the second tank42 are in contact with the upper face of the cold plate 10. The pump 30is disposed adjacent to the side face of the cold plate 10 and thesecond tank 42. This makes it possible to integrate the cold plate 10,the radiator 20, the pump 30, the first tank 41, and the second tank 42to reduce the size of the entire cooling device 1, thus improving thehandleability of the entire cooling device 1.

Since the cold plate 10, the radiator 20, and the pump 30 are directlyconnected, members such as pipes for coupling these are reduced. In thisway, the size of the cooling device 1 is further reduced. Hence, it ispossible to easily attach the cooling device 1 to an actual machine.Note that the cold plate 10, the radiator 20, and the pump 30 may becoupled using shortened pipes or the like in a region on the cold plate10.

The cold plate 10 is formed of a metal having a high thermalconductivity such as copper or aluminum, and has a bottom wall portion12, a top wall portion 13, and a side wall portion 14. In the presentexample embodiment, the cold plate 10 is rectangular in the top view.The bottom wall portion 12 and the top wall portion 13 each have a plateshape expanding in the horizontal direction in the top view. Note thatalthough the top wall portion 13 in the present example embodiment has arectangular shape in the top view, the shape of the top wall portion 13is not limited to this and may be for example a polygonal shape having aplurality of corners or a circular shape in the plan view. Aheat-generating component H (see FIG. 4) comes into contact with thelower face of the bottom wall portion 12.

In the cold plate 10, cut portions 10 d, 10 e are formed, which arerespectively bent side portions of the side face on the lateral side inthe top view. At least part of the pump 30 is disposed in the cutportion 10 d to face the side face of the cold plate 10. This makes itpossible to further reduce the size of the entire cooling device 1. Itis possible to increase the size and output of the pump 30 in thelimited space of the cooling device 1 while suppressing an increase insize of the entire cooling device 1.

The cold plate 10 has: a first cooling medium flow passage 11 in which acooling medium flows; the bottom wall portion 12; the top wall portion13; the side wall portion 14; an internal space U; the inlet port 13 a;and the outlet port 13 b. The lower face of the bottom wall portion 12comes into contact with the heat-generating component H. The top wallportion 13 covers the upper face of the bottom wall portion 12. The sidewall portion 14 couples the peripheral portion of the bottom wallportion 12 and the peripheral portion of the top wall portion 13. Theinternal space U is surrounded by the bottom wall portion 12, the topwall portion 13, and the side wall portion 14 to form the first coolingmedium flow passage 11. The inlet port 13 a is disposed on one end sideof the first cooling medium flow passage 11, and the cooling mediumflows into the inlet port 13 a. The outlet port 13 b is disposed on theother end side of the first cooling medium flow passage 11, and thecooling medium flows out of the outlet port 13 b. Inside the firstcooling medium flow passage 11, provided are a plurality of blades 12 awhich are disposed side by side in parallel.

In the present example embodiment, the side wall portion 14 is formed ofa member integral with the top wall portion 13. The first cooling mediumflow passage 11 is formed by a recess 10 f which is formed in the memberby a cutting process or the like to be depressed upward. The side wallportion 14 is formed on the outer periphery side of the recess 10 f. Thetop wall portion 13 and the side wall portion 14 may be formed ofseparate members. At this time, the first cooling medium flow passage 11is formed at an inner side of the side wall portion 14.

The side wall portion 14 has a step portion 14 e, which is depressedoutward, on a lower end portion of the inner peripheral face. The stepportion 14 e is formed in an annular shape (see FIG. 6). The upper faceof the bottom wall portion 12 comes into contact with the lower face ofthe step portion 14 e. This makes it easy to position the bottom wallportion 12 when attaching the bottom wall portion 12 to the top wallportion 13. The bottom wall portion 12 and the step portion 14 e arejoined together by welding, for example.

At this time, the lower end face of the side wall portion 14 and thelower face of the bottom wall portion 12 are formed at the same heightin the vertical direction. This makes the lower end face of the sidewall portion 14 and the lower face of the bottom wall portion 12 flushwith each other in the vertical direction. Hence, when theheat-generating component H is brought into contact with both of thelower end face of the side wall portion 14 and the lower face of thebottom wall portion 12, it is possible to bring the lower face of thecold plate 10 and the contact face of the heat-generating component Hinto contact with no gap. This allows heat generated by theheat-generating component H to be efficiently transmitted to the lowerface of the cold plate 10. It is possible to cool the heat-generatingcomponent H by bringing the heat-generating component H which has thecontact face larger than the bottom wall portion 12 into contact withthe lower face of the cold plate 10.

In the top wall portion 13, provided are the inlet port 13 a and theoutlet port 13 b which penetrate the top wall portion in the verticaldirection (see FIGS. 2 and 3). The cooling medium that has flowed intothe first cooling medium flow passage 11 through the inlet port 13 aflows out of the first cooling medium flow passage 11 through the outletport 13 b. In the present example embodiment, the cooling medium is aliquid, and for example, an antifreeze (an ethylene glycol aqueoussolution, a propylene glycol aqueous solution, or the like), pure water,or the like is used.

The radiator 20 has a plurality of fins 21 and a plurality of pipes 23 aand 23 b for cooling (see FIG. 5). The fins 21 are formed in a flatplate shape, and stand upright from the upper face of the top wallportion 13 and extend in the horizontal direction of the cold plate 10.In the present example embodiment, the cold plate 10 has thelongitudinal direction X and the lateral direction Y, and the pluralityof fins 21 extend in the lateral direction Y. The plurality of fins 21are arranged in parallel at equal intervals in the longitudinaldirection X of the cold plate 10.

The lower ends of the fins 21 are in contact with the upper face of thetop wall portion 13. This improves the thermal conductivity from the topwall portion 13 to the fins 21. Note that the fins 21 and the top wallportion 13 may be separate members or may be integrally formed as asingle member. In the present example embodiment, the fins 21 aremembers separate from the top wall portion 13. The lower ends of thefins 21 are joined to the upper face of the top wall portion 13 bywelding, for example.

When the fins 21 are in the same member as the top wall portion 13, thefins 21 are formed by performing a cutting process on the upper face ofthe top wall portion 13, for example. When the fins 21 and the top wallportion 13 are separate members, the fins 21 are preferably formed of ametal having a high thermal conductivity such as copper or aluminum asin the case of the above-described cold plate 10. Forming the fins 21 ofa metal having a high thermal conductivity like the cold plate 10 makesit possible to efficiently transmit heat from the cold plate 10 to thefins 21.

The pipes 23 a and 23 b form a second cooling medium flow passage 22which is hollow inside and through which the cooling medium flows. Thesecond cooling medium flow passage 22 communicates with the firstcooling medium flow passage 11. More specifically, the second coolingmedium flow passage 22 communicates with the first cooling medium flowpassage 11 through the pump 30, the first tank 41, and the second tank42.

The pipes 23 a and 23 b extend straight in the longitudinal direction Xof the cold plate 10. The pipe 23 a is formed in a flat cross-sectionand the pipe 23 b is formed in a circular cross-section. The pipes 23 aand 23 b are inserted through fin through-holes 24 provided in theplurality of fins 21 and fixed to the plurality of fins 21 by welding(see FIG. 4). Here, the direction in which the pipes 23 a and 23 bextend and the direction in which the fins 21 extend are orthogonal.That is, in the present example embodiment, the plurality of fins 21extend in the lateral direction Y and the pipes 23 a and 23 b extend inthe longitudinal direction X. Note that the directions in which the fins21 and the pipes 23 a and 23 b extend are not limited to these, and forexample, the pipes 23 a and 23 b may be disposed to be inclined relativeto the direction in which the fins 21 extend.

One ends of the pipes 23 a and 23 b are coupled to the first tank 41 andthe other ends of the pipes 23 a and 23 b are coupled to the second tank42. The first tank 41 and the second tank 42 are disposed on theopposite sides in the direction in which the pipes 23 a and 23 b extend.This allows the cooling medium to smoothly flow straight from the firsttank 41 to the second tank 42 through the pipes 23 a and 23 b.

The first tank 41 and the second tank 42 are disposed in parallel in thedirection in which the fins 21 are arranged, and a larger number of fins21 can be disposed at predetermined intervals between the first tank 41and the second tank 42. This makes it possible to increase the surfacearea of the entire fins 21, improving the cooling performance of theradiator 20. The pipes 23 a and 23 b can be easily connected to thefirst tank 41 and the second tank 42.

The pipes 23 a and 23 b penetrate the side faces of the first tank 41and the second tank 42 and are directly coupled to the first tank 41 andthe second tank 42 (see FIG. 4). This makes it possible to reduce thenumber of components of the cooling device 1 and also to elongate thepipes 23 a and 23 b in the longitudinal direction X, so that the coolingmedium can be efficiently cooled.

The pipes 23 a are disposed side by side in 3 lines in the horizontaldirection and also disposed side by side in 4 lines in the verticaldirection. In this way, 12 pipes 23 a in total are connected in parallel(see FIG. 4). One pipe 23 b is disposed and connected in parallel withthe pipes 23 a.

In this way, the plurality of pipes 23 a and 23 b penetrate the fins 21,so that heat is transmitted from the pipes 23 a and 23 b to the fins 21.For this reason, it is possible to efficiently cool the cooling mediumflowing through the pipes 23 a and 23 b while suppressing an increase insize of the cooling device 1.

Note that the flow rate of the cooling medium flowing through theplurality of pipes 23 a can be adjusted by changing the diameter of thepipe 23 b and the diameter of the pipe 23 b is selected appropriatelydepending on the cooling device 1.

The total number of the pipes 23 a and 23 b is not limited and may be 12or less or 14 or more. The plurality of pipes 23 a do not necessarilyhave to be disposed at equal intervals and may be disposed such that thepositions of the respective pipes 23 a are different in the verticaldirection.

The first tank 41 and the second tank 42 each are cuboidal. In the lowerface of the first tank 41, the first tank through-hole 41 a is formed.The first tank through-hole 41 a coincides with the outlet port 13 b ofthe top wall portion 13 in the vertical direction and communicates withthe outlet port 13 b (see FIG. 3). The second tank 42 has the secondtank through-hole 42 a formed in the surface opposite to the surface inwhich the pipes 23 a and 23 b are coupled (see FIG. 3). The second tankthrough-hole 42 a communicates with the suction port 31 a of the pump 30(see FIG. 3).

The pump 30 in the present example embodiment is a centrifugal pumphaving a passage for the cooling medium inside a cuboid casing 31 (notillustrated). An impeller (not illustrated) is disposed in the passage.Specifically, the pump 30 has the impeller as described later. In thecasing 31, the suction port 31 a is formed in one of adjacent side facesand the discharge port 31 b is formed in the other of the adjacent sidefaces. The discharge port 31 b protrudes outward from the side face ofthe casing 31 and communicates with the inlet port 13 a (see FIG. 2).

The cooling device 1 includes a discharge portion 32. The dischargeportion 32 is a member made of a metal which is screwed to the coldplate 10. The discharge portion 32 has the discharge port 31 b. Thedischarge port 31 b is formed by performing a cutting process on thedischarge portion 32. That is, the discharge portion 32 having thedischarge port 31 b is a member separate from the casing 31. A pipe (notillustrated) that communicates with the passage inside the casing 31 andprotrudes from the side face of the casing 31 is inserted into thedischarge port 31 b. In this way, the casing 31 and the dischargeportion 32 are coupled, so that the passage inside the casing 31 and theinlet port 13 a communicate through the discharge port 31 b. Thedischarge portion 32 in the present example embodiment is a member madeof a metal; however, this is exemplary and the discharge portion 32 maybe formed of a member of rubber or the like.

The discharge port 31 b has the outward portion 31 c and the downwardportion 31 d. The outward portion 31 c extends outward from the sideface of the casing 31 and is inclined downward as separating from thecasing 31. The downward portion 31 d extends downward from the front endof the outward portion 31 c. This makes it possible to shorten thedischarge port 31 b in the lateral direction Y, reducing the size of theentire cooling device 1.

Forming the discharge portion 32 of a member separate from the casing 31makes it possible to easily connect the pump 30 and the cold plate 10through the discharge portion 32 even when the position of the inletport 13 a is changed in the horizontal direction. Only the direction inwhich the discharge port 32 extends has to be designed and there is noneed to change in design the direction in which the cooling medium isdischarged from the pump 30. For this reason, the manufacturing cost ofthe cooling device 1 can be reduced. Note that although in the presentexample embodiment, the outward portion 31 c extends downward asseparating from the casing 31, the outward portion 31 c may extend inthe horizontal direction.

The impeller of the pump 30 is supported to be rotatable about a centralshaft. The central shaft extends in the direction in which the coolingmedium flows in the second cooling medium flow passage 22 and is coupledto a rotary shaft of a motor (not illustrated). The drive of the motorrotates the impeller to discharge, from the discharge port 31 b, thecooling medium which has flowed from the suction port 31 a.

The pump 30 sucks the cooling medium in the direction in which thesecond cooling medium flow passage 22 extends through the suction port31 a (see FIG. 3). This allows the cooling medium which has flowed intothe second tank 42 from the pipes 23 a and 23 b to smoothly flow intothe suction port 31 a. Hence, it is possible to smoothen the flow of thecooling medium and reduce the power consumption of the pump 30.

FIG. 6 is a bottom view of the top wall portion 13 and the side wallportion 14 which are formed integrally, and FIG. 7 is a top view of thebottom wall portion 12. Note that in FIG. 7, the dashed-dotted linesindicate the inlet port 13 a and the outlet port 13 b provided in thetop wall portion 13. In the top wall portion 13, the cut portions 10 dand 10 e are formed, which are respectively bent side portions of theside face on the lateral side. The inlet port 13 a is disposed betweenthe cut portions 10 d and 10 e.

The bottom wall portion 12 has the plurality of blades 12 a on the upperface. The plurality of blades 12 a extend in the longitudinal directionX of the cold plate 10 and are disposed side by side in parallel atequal intervals in the lateral direction Y. The upper ends of the blades12 a and the lower face of the top wall portion 13 are in contact (seeFIG. 5). This allows the cooling medium to flow through the spacesurrounded by the adjacent blades 12 a, the top wall portion 13, and thebottom wall portion 12. Hence, it is possible to efficiently transmitheat generated by the heat-generating component H to the cooling mediumthrough the blades 12 a. When the heat-generating component H is broughtinto contact with the lower face of the bottom wall portion 12, thebottom wall portion 12 is supported through the blades 12 a. This makesit possible to prevent the bottom wall portion 12 from being deformed.Non-formation regions W where the blades 12 a are not provided areformed in the bottom wall portion 12 directly below the inlet port 13 aand the outlet port 13 b.

The inner peripheral wall of the side wall portion 14 has bent portions(a first bent portion) 14 a, 14 b and bent portions (a second bentportion) 14 c, 14 d. The bent portions 14 a, 14 b are bent to be convexinward between one ends of the blades 12 a and the outlet port 13 b. Thebent portions 14 c, 14 d are bent to be convex inward between the otherends of the blades 12 a and the inlet port 13 a.

This brings the inner peripheral wall of the side wall portion 14 closerto both ends of the blades 12 a, making it possible to reduce the areaof the non-formation region W. The bottom wall portion 12 is supportedby the side wall portion 14 outside the bent portions 14 a, 14 b, 14 c,14 d. This makes it possible to increase the strength of the bottom wallportion 12.

Since the bottom wall portion 12 is disposed on the annular step portion14 e extending along the inner peripheral wall of the side wall portion14, the outer peripheral face of the bottom wall portion 12 is bentinward corresponding to the bent portions 14 a, 14 b, 14 c, 14 d. Thismakes it possible to further increase the strength of the bottom wallportion 12.

Hence, it is possible to reduce the deflection of the bottom wallportion 12 and thus prevent the lower face of the cold plate 10, whichcomes into contact with the heat-generating component H, from beingdeformed.

The bent portions 14 a, 14 b, 14 c, 14 d are each bent in a curved formin the top view. Specifically, part of each bent portion 14 a, 14 b, 14c, 14 d is curved inward. This makes it possible to reduce the flowresistance of the cooling medium flowing through the first coolingmedium flow passage 11. Note that although in the present exampleembodiment, each bent portion 14 a, 14 b, 14 c, 14 d is bent in a curvedform in the top view, the bent portion may be bent in a straight form inthe top view. In this case, while the flow resistance of the coolingmedium flowing through the first cooling medium flow passage 11 isincreased, the strength of the bottom wall portion 12 is increased.

The bent portions 14 c, 14 d are disposed on both sides of the inletport 13 a in the direction in which the blades 25 are arranged. The bentportions 14 c, 14 d are formed symmetrically in the horizontal directionwith the inlet port 13 a disposed in between in the top view. Thisallows the cooling medium which has flowed out of the inlet port 13 a touniformly spread in the lateral direction Y.

The first cooling medium flow passage 11 is formed to become wider inthe horizontal direction as extending from the inlet port 13 a towardthe other ends of the blades 12 a. This allows the cooling medium whichhas flowed into the first cooling medium flow passage 11 through theinlet port 13 a to smoothly spread in the longitudinal direction X andthe lateral direction Y in the non-formation region W between the blades12 a and the inlet port 13 a. Thereafter, the cooling medium flowsthrough between the adjacent blades 12 a to spread over the entire lowerface of the cold plate 10. This makes it possible to suppress unevennessof cooling of the cold plate 10. Note that although in the presentexample embodiment, the bent portions 14 c and 14 d are provided on bothsides of the inlet port 13 a, one of the bent portions 14 c and 14 d maybe omitted.

The bent portions 14 a and 14 b are provided on both sides of the outletport 13 b in the direction in which the blades 25 are arranged and thefirst cooling medium flow passage 11 is formed to become narrower in thehorizontal direction as extending from the ends of the blade 12 a towardthe outlet port 13 b. This allows the cooling medium which has flowedthrough between the plurality of blades 12 a to smoothly flow toward theoutlet port 13 b. Note that although in the present example embodiment,the bent portions 14 a and 14 b are provided on both sides of the outletport 13 b, one of the bent portions 14 a and 14 b may be omitted.

The heat-generating component H comes into contact with the lower faceof the bottom wall portion 12 (see FIG. 3). At this time, theheat-generating component H is preferably disposed on the lower face ofthe bottom wall portion 12 facing the first cooling medium flow passage11 in the vertical direction. Since the heat-generating component H andthe first cooling medium flow passage 11 are disposed to face each otherin the vertical direction, it is possible to efficiently transmit theheat generated by the heat-generating component H to the cooling mediumflowing through the first cooling medium flow passage 11.

The heat-generating component H is more preferably positioned below theregion where the blades 12 a are disposed. That is, the heat-generatingcomponent H is positioned inside the width of the blades 12 a in thelongitudinal direction X in which the blades 12 a extend and inside thearrangement width of the blades 12 a in the lateral direction Y in whichthe blades 12 a are arranged. Disposing the heat-generating component Hat a position over the above-described region makes it possible to moreefficiently cool the heat-generating component H. The bottom wallportion 12 has a higher strength in the above-described region, thuspreventing the bottom wall portion 12 from being deformed.

The heat-generating component H is more preferably disposed at aposition over the line connecting the inlet port 13 a and the outletport 13 b. The cooling medium circulating in the cooling device 1 iscooled by the radiator 20 near the line connecting the inlet port 13 aand the outlet port 13 b. For this reason, disposing the heat-generatingcomponent H on the above-described line makes it possible to moreefficiently cool the heat-generating component H.

A heat-generating component such as a CPU to be cooled is brought intocontact with the lower face of the bottom wall portion 12 of the coldplate 10 and the pump 30 is driven. This causes the cooling medium tocirculate through the first cooling medium flow passage 11, the firsttank 41, the second cooling medium flow passage 22, and the second tank42 in this order. Heat generated by the heat-generating component istransmitted to the bottom wall portion 12 of the cold plate 10. The heattransmitted to the bottom wall portion 12 is then transmitted to thefins 21 through the top wall portion 13 and also transmitted to the fins21 through the cooling medium flowing through the first cooling mediumflow passage 11 and the second cooling medium flow passage 22. In thisway, the heat is dissipated through the fins 21, so that an increase intemperature of the heat-generating component can be suppressed.

It is possible to further improve the cooling performance of theradiator 20 by disposing a cooling fan (not illustrated) at the lateralside of the radiator 20 to send a cooling air in the direction in whichthe fins 21 extend (the lateral direction Y), promoting the heatdissipation from the fins 21.

The above-described example embodiment is merely an example of thepresent disclosure. The configuration of the example embodiment may bemodified as appropriate within the scope of the technical idea of thepresent disclosure. The example embodiments may be combined to beimplemented within a possible range.

Although the centrifugal pump 30 is used in the above-described exampleembodiment, a diaphragm or cascade pump or the like may be used, forexample. Although the inlet port 30 a and the outlet port 30 b penetratethe top wall portion 13 in the vertical direction, these ports maypenetrate the side wall portion 14 in the horizontal direction.

The motor of the present disclosure can be utilized in a cooling devicefor cooling an electronic component such as a microcomputer.

While example embodiments of the present disclosure have been describedabove, it is to be understood that variations and modifications will beapparent to those skilled in the art without departing from the scopeand spirit of the present disclosure. The scope of the presentdisclosure, therefore, is to be determined solely by the followingclaims.

What is claimed is:
 1. A cooling device comprising: a cold plate whichhas a first cooling medium flow passage in which a cooling medium flows;a radiator which has a plurality of fins and a plurality of pipesforming a second cooling medium flow passage communicating with thefirst cooling medium flow passage; a pump which circulates the coolingmedium; a first tank which is coupled to one ends of the plurality ofpipes; and a second tank which couples the other ends of the pluralityof pipes to the pump, wherein the radiator is disposed on the coldplate, the cold plate has: a bottom wall portion a lower face of whichcomes into contact with a heat-generating component; a top wall portionwhich covers an upper face of the bottom wall portion; a side wallportion which couples a peripheral portion of the bottom wall portionand a peripheral portion of the top wall portion; an internal spacewhich is surrounded by the bottom wall portion, the top wall portion,and the side wall portion to form the first cooling medium flow passage;an inlet port which is disposed on one end side of the first coolingmedium flow passage and into which the cooling medium flows; and anoutlet port which is disposed on the other end side of the first coolingmedium flow passage and out of which the cooling medium flows, thebottom wall portion has a plurality of blades on the upper face, and aninner peripheral wall of the side wall portion has a first bent portionwhich is bent to be convex inward between one ends of the blades and theoutlet port.
 2. The cooling device according to claim 1, wherein thefirst bent portion is bent in a curved form in a top view.
 3. Thecooling device according to claim 1, wherein the first bent portion isdisposed on both sides of the outlet port in a direction in which theblades are arranged.
 4. The cooling device according to claim 1, whereinthe inner peripheral wall of the side wall portion has a second bentportion which is bent to be convex inward between the other ends of theblades and the inlet port.
 5. The cooling device according to claim 4,wherein the second bent portion is bent in a curved form in a top view.6. The cooling device according to claim 4, wherein the second bentportion is disposed on both sides of the inlet port in a direction inwhich the blades are arranged.
 7. The cooling device according to claim6, wherein the second bent portions are formed symmetrically in ahorizontal direction with the inlet port disposed in between in the topview.
 8. The cooling device according to claim 4, wherein the firstcooling medium flow passage is formed to become wider in a horizontaldirection as extending from the inlet port toward the other ends of theblades.
 9. The cooling device according to claim 1, wherein the firstcooling medium flow passage is formed to become narrower in a horizontaldirection as extending from the one ends of the blades toward the outletport.
 10. The cooling device according to claim 1, wherein the side wallportion has a step portion which is depressed outward, on a lower endportion of the inner peripheral face, and the upper face of the bottomwall portion comes into contact with a lower face of the step portion.11. The cooling device according to claim 10, wherein a lower end faceof the side wall portion and the lower face of the bottom wall portionare formed at the same height in a vertical direction.
 12. The coolingdevice according to claim 1, wherein upper ends of the blades come intocontact with the lower face of the top wall portion.